3com WXR100 3CRWXR10095A Manuel D’Utilisation

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The gigabit Ethernet ports on a WX4400 have two physical interfaces: a 
1000BASE-TX copper interface and a 1000BASE-SX or 1000BASE-LX 
fiber interface. The copper interface is provided by a built-in RJ-45 
connector. The fiber interface is optional and requires insertion of a 
Gigabit interface converter (GBIC). 

Only one interface can be active on a port. By default, MSS prefers the 
GBIC (fiber) interface. You can configure a port to prefer the RJ-45 
(copper) interface instead. 

If you set the preference to RJ-45 on a port that already has an active 
fiber link, MSS immediately changes the link to the copper interface. 

To disable the fiber interface and enable the copper interface on a 
WX4400 port, use the following command:

set port media-type port-list rj45

To disable the copper interface and reenable the fiber interface on a 
WX4400 port, use the following command:

clear port media-type port-list

To display the enabled interface type for each port, use the following 
command:

display port media-type [port-list]

To disable the fiber interface and enable the copper interface of port 2 on 
a WX4400 switch and verify the change, type the following commands:

WX4400# set port media-type 2 rj45
WX4400# display port media-type
Port Media 

Type

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   1  GBIC
   2  RJ45
   3  GBIC
   4  GBIC